EP0298840A3 - Magnetic recording medium and manufacturing method thereof - Google Patents

Magnetic recording medium and manufacturing method thereof Download PDF

Info

Publication number
EP0298840A3
EP0298840A3 EP88401694A EP88401694A EP0298840A3 EP 0298840 A3 EP0298840 A3 EP 0298840A3 EP 88401694 A EP88401694 A EP 88401694A EP 88401694 A EP88401694 A EP 88401694A EP 0298840 A3 EP0298840 A3 EP 0298840A3
Authority
EP
European Patent Office
Prior art keywords
manufacturing
recording medium
magnetic recording
magnetic
medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88401694A
Other versions
EP0298840B1 (en
EP0298840A2 (en
Inventor
Hiroaki Wakamatsu
Yoshihiro Mitobe
Katsumi Kiuchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of EP0298840A2 publication Critical patent/EP0298840A2/en
Publication of EP0298840A3 publication Critical patent/EP0298840A3/en
Application granted granted Critical
Publication of EP0298840B1 publication Critical patent/EP0298840B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
    • G11B5/65—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent characterised by its composition
    • G11B5/657—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent characterised by its composition containing inorganic, non-oxide compound of Si, N, P, B, H or C, e.g. in metal alloy or compound
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/7368—Non-polymeric layer under the lowermost magnetic recording layer
    • G11B5/7373—Non-magnetic single underlayer comprising chromium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12465—All metal or with adjacent metals having magnetic properties, or preformed fiber orientation coordinate with shape
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12806—Refractory [Group IVB, VB, or VIB] metal-base component
    • Y10T428/12826—Group VIB metal-base component
    • Y10T428/12847—Cr-base component
    • Y10T428/12854—Next to Co-, Fe-, or Ni-base component
EP88401694A 1987-07-09 1988-06-30 Magnetic recording medium and manufacturing method thereof Expired - Lifetime EP0298840B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP62172219A JPH0827927B2 (en) 1987-07-09 1987-07-09 Magnetic recording media
JP172219/87 1987-07-09

Publications (3)

Publication Number Publication Date
EP0298840A2 EP0298840A2 (en) 1989-01-11
EP0298840A3 true EP0298840A3 (en) 1989-10-11
EP0298840B1 EP0298840B1 (en) 1993-03-24

Family

ID=15937802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88401694A Expired - Lifetime EP0298840B1 (en) 1987-07-09 1988-06-30 Magnetic recording medium and manufacturing method thereof

Country Status (4)

Country Link
US (1) US5047297A (en)
EP (1) EP0298840B1 (en)
JP (1) JPH0827927B2 (en)
DE (1) DE3879560T2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2062154C (en) * 1991-05-14 1997-01-21 David Alvoid Edmonson Underlayer doping in thin film magnetic recording media
US5232566A (en) * 1991-05-14 1993-08-03 International Business Machines Corporation Underlayer doping in thin film magnetic recording media
US6287429B1 (en) 1992-10-26 2001-09-11 Hoya Corporation Magnetic recording medium having an improved magnetic characteristic
JP2778494B2 (en) * 1994-12-26 1998-07-23 日本電気株式会社 Electrode thin film and magnetoresistive head using the electrode thin film
US8559178B2 (en) * 2010-10-11 2013-10-15 Lockheed Martin Corporation Cardlock clamp

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986005214A1 (en) * 1985-02-28 1986-09-12 Trimedia Corporation Thin-film storage disk and method
EP0216610A1 (en) * 1985-09-23 1987-04-01 International Business Machines Corporation Vertical magnetic recording medium with multilayered magnetisable film structure
DE3707522A1 (en) * 1986-03-12 1987-09-24 Matsushita Electric Ind Co Ltd MAGNETIC NITRIDE FILM

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231816A (en) * 1977-12-30 1980-11-04 International Business Machines Corporation Amorphous metallic and nitrogen containing alloy films
JPS57191830A (en) * 1981-05-22 1982-11-25 Sony Corp Magnetic recording medium
US4675240A (en) * 1982-11-22 1987-06-23 International Business Machines Corporation Magnetic recording disk using silicon substrate
JPH0711854B2 (en) * 1984-12-30 1995-02-08 ティーディーケイ株式会社 Magnetic recording medium
US4880514A (en) * 1985-05-03 1989-11-14 Akshic Memories Corporation Method of making a thin film magnetic disk
US4749459A (en) * 1986-03-10 1988-06-07 Komag, Inc. Method for manufacturing a thin film magnetic recording medium

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986005214A1 (en) * 1985-02-28 1986-09-12 Trimedia Corporation Thin-film storage disk and method
EP0216610A1 (en) * 1985-09-23 1987-04-01 International Business Machines Corporation Vertical magnetic recording medium with multilayered magnetisable film structure
DE3707522A1 (en) * 1986-03-12 1987-09-24 Matsushita Electric Ind Co Ltd MAGNETIC NITRIDE FILM

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *

Also Published As

Publication number Publication date
US5047297A (en) 1991-09-10
JPH0827927B2 (en) 1996-03-21
EP0298840B1 (en) 1993-03-24
JPS6417217A (en) 1989-01-20
EP0298840A2 (en) 1989-01-11
DE3879560D1 (en) 1993-04-29
DE3879560T2 (en) 1993-07-01

Similar Documents

Publication Publication Date Title
DE3568658D1 (en) Magnetic recording medium and manufacturing method thereof
EP0468778A3 (en) A magnetic recording medium and a method of manufacturing the same
EP0277783A3 (en) Magnetic recording medium
EP0432536A3 (en) Magnetic recording medium and method for making it
EP0309202A3 (en) Magnetic recording medium
DE3377829D1 (en) Perpendicular magnetic recording medium and manufacturing method thereof
EP0249216A3 (en) Magnetic recording medium and method of manufacturing the same
GB2208493B (en) Magnetic visual recording media and methods of making the same
DE3573672D1 (en) Magnetic recording medium and production thereof
EP0530379A4 (en) Vertical magnetic recording medium and its manufacturing method
EP0409216A3 (en) Magnetic recording media and method for making them
EP0318004A3 (en) Magnetic recording medium
EP0174024A3 (en) Magnetic recording medium and method of producing the same
DE3563662D1 (en) Perpendicular magnetic recording medium and production process thereof
EP0304927A3 (en) Perpendicular magnetic recording medium
EP0405450A3 (en) Data recording medium and method of manufacturing the same
EP0198472A3 (en) Magnetic recording medium and method for producing the same
EP0318931A3 (en) Drum assembly in magnetic recording/reproducing apparatus and manufacturing method thereof
EP0415155A3 (en) A perpendicular magnetic recording medium and method of forming the same
EP0298840A3 (en) Magnetic recording medium and manufacturing method thereof
DE3572240D1 (en) Magneto-optical recording medium and manufacturing method thereof
EP0243798A3 (en) Magnetic recording medium and method of manufacturing the same
EP0248402A3 (en) Magnetic recording medium and production thereof
EP0295813A3 (en) Magnetic recording medium and a method for producing the same
EP0409217A3 (en) Magnetic recording media and method for making them

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19891204

17Q First examination report despatched

Effective date: 19910910

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 3879560

Country of ref document: DE

Date of ref document: 19930429

ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19980609

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19980622

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990630

Ref country code: FR

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19990630

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19990630

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20030710

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050630